The compulsion of loving the five pious:
According to Ibn Abbas, When the verse: ‘I do not ask for any recompense for this (preaching the faith Messengership), but (seek) love for (my) kindred (and Allah’s nearness).(al-Shura-23) was revealed, people asked; ‘O’ Messenger of Allah, Who those, whose love has been made obligatory upon us?’ He replied: ‘Ali, Fathima and their sons.’
Reported by Tabarani in Mu’jm al-kabeer-2641.
Aal-e-Qutub Aal-e-Syed Abdullah Shah Ghazi 